Investigation of effective parameters on the production of high-temperature super-refractory ZrB۲-SiC by SPS method

The aim of this research is to produce high-temperature super-refractory ZrB۲-SiC and investigate the parameters affecting it. The results showed that increasing the temperature to ۱۷۰۰ C۰ initially causes the structure to become discontinuous and porous. This process is reversed when the temperature is increased again, forming a continuous and dense structure. It is observed that with increasing the duration of the SPS process, more glass phase is produced on the surface, which causes the surface integrity to increase. In the following, due to the continuous dissolution and sedimentation mechanisms in the presence of the liquid phase, which causes mass transfer and grain growth, we will witness and cause the growth of ZrB۲ and SiC grains. By performing the heat treatment process at a temperature of ۱۴۰۰ degrees Celsius, we see an increase in mass in all samples. This is due to the introduction of oxygen into the sample composition. It can be seen that in the samples that were milled for ۳ hours, they oxidized uniformly and with a low intensity. In the sample of ۹ hours of grinding, because the grains have become rarer and with the increase in fineness of these grains, the active surfaces have increased and the surface in contact with oxygen has increased. In ۱۵ hours of grinding work, with a further reduction in the size of the primary ZrB۲SiC particles, less empty space is created between the particles compared to ۹ hours, and the required surface area for oxidation is reduced.

کلیدواژه ها:

ZrB۲-SiC ، super-refractory ، SPS ، ball milling